VSI sand making machine
In the production of manufactured sand and aggregates, the selection of raw materials is closely related to the capabilities of the processing equipment. As a manufacturer of mining crushing equipment, we understand that choosing the right equipment is the first step to project success. The VSI (Vertical Shaft Impact) sand making machine, with its unique "stone-on-stone" and "stone-on-iron" principles, has become a core piece of equipment in the fields of medium and fine crushing and sand making. However, many customers often ask: Which raw materials is the VSI sand making machine suitable for crushing? This article will provide an in-depth analysis to help you make the best choice.
I. Overview of the Working Principle and Applicability of the VSI Sand Making Machine
Structural diagram of VSI sand making machine
The core working principle of the VSI sand making machine is to use a high-speed rotating impeller to throw the material out, where it collides and rubs against the circumferential plates or the material itself, thus crushing it. This crushing method combines impact, grinding, and self-crushing effects, making it particularly suitable for medium-hard, extra-hard, and moderately abrasive materials, aiming to obtain high-quality manufactured sand and fine aggregates with excellent particle shape and reasonable gradation.
Unlike jaw crushers, cone crushers, and other compression crushers, the VSI machine focuses more on shaping and sand making, rather than simply reducing size. Therefore, the physical properties of the raw materials (such as hardness, abrasiveness, soil content, and moisture content) are key to determining their suitability.
II. Analysis of Raw Material Types Suitable for VSI Sand Making Machines
2.1 High-Hardness Rocks
Made from these raw materials, the manufactured sand boasts high strength and high market demand, making it the ideal platform for VSI sand making machines to perform efficiently.
• Granite: High hardness, wear resistance, and compressive strength. The crushed sand particles are mostly cubic with good gradation, making it the preferred raw material for high-quality concrete sand.
• Diabase/Basalt: Extremely hard, wear-resistant, and compressive-resistant, it is an excellent raw material for producing high-grade aggregates and manufactured sand required for highways, railways, and airport runways. VSI machines can effectively improve its particle shape.
• Quartzite/Quartz Sandstone: Extremely hard and high in silicon. Although it causes significant wear on the impeller and peripheral plates, with the selection of wear-resistant parts and a reasonable "stone-on-stone" chamber design, it can still efficiently produce high-quality glass sand, foundry sand, and other specialty sands.
2.2 Medium-Hardness Rocks
These raw materials are easily crushed, have relatively low energy consumption, and high output.
• Limestone: This is the most economical and common application of VSI sand making machines. The finished sand particles are rounded, and the stone powder content is controllable. It is widely used in construction, concrete, and desulfurization limestone powder production.
• Dolomite: Similar in properties to limestone, it is also very suitable for VSI crushing and used as building aggregate and magnesium fertilizer raw material.
• Andesite: Medium hardness, moderate wear resistance, and good particle shape after crushing. It is often used in construction and foundation engineering.
2.3 Construction Waste and Industrial By-products
VSI sand making machines are playing a significant role in resource recycling.
• Construction Waste: Concrete blocks, waste bricks, and tiles, after preliminary impurity removal and crushing, can be finely crushed and shaped using a VSI machine to produce recycled aggregate and recycled sand for paving, brick making, and low-grade concrete.
• Metallurgical slag: Such as blast furnace slag and steel slag, after crushing and screening by a VSI machine, can yield high-value building material raw materials with good particle shape.
III. Raw materials requiring careful handling or not recommended
• High-viscosity, high-earth-content materials: Such as untreated mud and clay, which easily lead to blockage of the crushing chamber and discharge port.
• High-moisture materials: When the material moisture content is too high (e.g., exceeding 8%-10%) and contains mud, it is prone to sticking, affecting throughput and screening efficiency.
• Highly abrasive materials (such as some severely eroded ores): This will lead to a sharp reduction in the life of wear-resistant parts and a surge in operating costs, requiring a comprehensive assessment of economic viability. This can be partially alleviated by prioritizing the use of a "stone-on-stone" chamber design.
VSI sand making machine customer site
IV. Case Study Sharing of Our VSI Sand Making Machine's Advantages
Case Study: A large-scale green building materials base in East China
• Raw material: Granite tailings (0-12mm).
• Challenge: Existing products had a high proportion of needle-like and flaky particles, unreasonable gradation, and low market value.
• Solution: Adopting our VSI-1145 sand making machine, equipped with convertible "stone-on-stone" and "stone-on-iron" chambers. For the high hardness of granite, we used our specially designed composite wear-resistant alloy cutter heads.
• Results: The finished manufactured sand has a perfect cubic shape, adjustable fineness modulus, and controllable stone powder content. The product has quickly become the designated sand for local commercial concrete mixing plants, increasing its selling price by over 30%.
V. Recommended Related Equipment
In an efficient sand making production line, the VSI sand making machine is usually the core, but not the only, piece of equipment. We recommend the following combination:
1. Coarse Crushing Stage: Jaw Crusher for handling large raw materials.
2. Medium Crushing Stage: Cone Crusher or Impact Crusher for medium and fine crushing, providing suitable feed for the VSI machine (recommended feed particle size ≤50mm). 3. Screening and Washing Stage: Vibrating screens, wheel sand washers, or spiral sand washers are used for grading, removing impurities, and controlling stone powder.
VI. Frequently Asked Questions (FAQ)
Q1: What is the difference between a VSI sand making machine and an impact crusher? Which is more suitable for sand making?
A1: Impact crushers are mainly used for medium crushing, focusing more on "crushing," producing products with acceptable particle shape but still containing a large number of needle-like and flaky particles. The core of the VSI machine is "shaping" and "sand making," achieving high-quality manufactured sand with a particle shape far exceeding that of an impact crusher through "stone-on-stone" crushing. For production lines whose core objective is to produce high-quality manufactured sand, the VSI machine is a more professional choice.
Q2: How to reduce the wear cost of a VSI sand making machine when processing high-hardness rocks?
A2: First, prioritize the use of a "stone-on-stone" chamber design, allowing materials to collide with each other, reducing direct wear on wear-resistant parts. Second, choose manufacturers like us that provide high-quality composite wear-resistant alloy cutter heads and peripheral guards. Finally, optimizing the feed particle size and ensuring continuous and uniform feeding to avoid idling can effectively extend the life of vulnerable parts.
Q3: My raw material has a high moisture content; can I still use the VSI sand making machine?
A3: An assessment is needed. If it's only surface moisture, it can be improved through pre-screening and adjusting the production line layout. If the material itself is highly viscous and has a high moisture content, it's recommended to dry or air-dry it first; otherwise, it's very easy to clog. Ideally, you should provide a raw material sample for testing and analysis at the initial project planning stage.
About of Baichy Heavy Industry
Baichy Heavy Industry is a high-tech mining equipment company integrating R&D, manufacturing, sales, and after-sales service. Focusing on crushing, grinding, and mineral processing equipment, we provide professional solutions to our customers. We are ISO9001:2015 、certified, and our products include mobile crushing palnts, crawler crushing plant, construction waste crushing plants, jaw crushers, sand making machines, cone crushers, fine crushers, grinding mills, ball mills, etc., all with reliable performance to meet diverse project needs.
Our advantages:
• Professional pre-sales support: Free project design and comprehensive solutions to help you accurately select the right equipment;
• Comprehensive on-site service: Providing installation guidance and worker training to ensure smooth equipment commissioning;
• Reliable after-sales guarantee: A complete after-sales system, timely response to technical inquiries and equipment maintenance, ensuring long-term stable operation.
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